Posts Tagged ‘Chemicals’

CBSE Chemistry Class 12 Sample Paper – ALDEHYDES , KETONES AND CARBOXYLIC ACID

MM : 25                                          TIME : 45 min.
1. Write a chemical equation each to illustrate the following reaction;
(a) Aldol condensation reaction
(b) Cannizzaro reaction
(c) Rosenmund’s reaction
(d) Gattermann – Koch reaction
(e) Clemmensen reduction
2. Convert the following;
(a) Propanone to propene
(b) Propanal to butanone
(c) Benzoic acid to benzaldehyde
(d) Acetone to t-butyl alcohol
(e) Formaldehyde to urotropine
3. Give one chemical test to distinguish Propanal and diethyl ether.
4. Explain why formic acid is more stronger acid than acetic acid ?
5. Explain why carboxylic acid have higher boiling points than alcohols of comparable molecular masses?
6. Why carboxylic acid do not give the characteristic reaction of carbonyl group?
7. Arrange salicylic acid , p-hydroxybenzoic acid , m- hydroxybenzoic acid , benzoic acid in order of increasing acidic strength?
8. Give IUPAC name of Crotonaldehyde .
9. What is Grignard reagent ? How it is used to prepare tertiary butyl alcohol?
10. An alkyl halide when reacts with Aq. NaOH give ‘X’ “X’ in presence of Cu at 573 K gives ‘Y’. ‘Y’ in presence of conc. NaOH gives CH3OH + HCOONa

 

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CBSE Chemistry Class 12 Sample Paper – ALCOHOLS , PHENOLS AND ETHERS

MM : 25                                TIME : 45min.
1. Write a chemical equation each to illustrate the following reaction;
(a) Reimer – Tiemann reaction
(b) Kolbe’s reaction
(c) Coupling reaction
(d) Fischer esterification
2. Describe the mechanism of acid dehydration of ethanol to yield ethane.
3. Describe a chemical test to distinguish between Primary, secondary and tertiary alcohols.
4. Convert the following :
a. Cyclohehexanol to cyclohexan-1-one
b. Butan- 1 – ol to Butanoic acid .
c. Ethanol to 3- hydroxybutanal
d. Primary alcohol to an aldehyde
e. Ethanol to acetone
5. Explain why Phenols are much more acidic than alcohols ?
6. Explain why the boiling points of ethers are much lower than those of the alcohols of comparable molar masses?
7. What is absolute alcohol?
8. Compound A reacts with CH3MgBr reacts in presence of water gives Butan-2- ol . Bautan-2-ol in the presence of conc. H2SO4 gives B which reacts with Br2 to form C .C reacts with Alc. KOH gives D . Find A , B, C,D
9. Explain why cleavage of alkyl phenyl ethers with HBr always produces phenol and alkyl bromides and not bromobenzene and alkanols.
10. Convert the following :
(a) Phenol to Benzoquinone
(b) Anisole to Phenol
(c) Phenol to acetophenone

 

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CBSE Class 12 Chemistry Test – Organic Compunds containing Nitrogen

MM : 25                                                                                        TIME : 45min.
1. Write a chemical equation each to illustrate the following reaction:
(a) Carbylamine reaction
(b) Hofmann – bromamide reaction
(c) Gabriel phthalimide synthesis
(d) Balz – Schiemann reaction
(e) Diazotisation reaction
2. Separate primary secondary and tertiary amines on the basis of Hinsberg’s method.
3. Convert the following :
(a) Aniline into fluorobenzene
(b) Toluene into p-toluic acid.
(c) Aniline to sulphanilic acid .
4. Why are amines are less acidic than alcohols of comparable molecular masses?
5. How is basic strength of aromatic amines affected by the presence of electron releasing group on the benzene ring?
6. Explain why Amino group in ethylamine is basic but not in acetamide ?
7. Out of aliphatic and aromatic amines which one is soluble in water and why?
8. Give one chemical test to distinguish between benzyl amine and anilne.
9. What happens when ethylamine is treated with CHCl3 in the presence of ethanolic KOH.
10. Discuss the importance of pH in coupling reaction.

 

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Differences between acid and base and other questions

  1. List two difference between acid and base on  the basis of chemical properties
  2. Using the quation for electrolytic decomposition of water differentiate between a skeletal chemical equation and a balanced chemical equation
  3. State the change in colour name of the compound when iron material is exposed to air

Be the first to comment - What do you think?  Posted by admin - September 16, 2012 at 6:45 am

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